ref: c6a92afc7ac0382d90bf0fbd1d2e3e258a57aad4
dir: /sys/src/cmd/auth/rsa2asn1.c/
#include <u.h> #include <libc.h> #include <auth.h> #include <mp.h> #include <libsec.h> #include "rsa2any.h" int privatekey = 0; char *format = "pkcs1"; void usage(void) { fprint(2, "usage: auth/rsa2asn1 [-a] [-f fmt] [file]\n"); exits("usage"); } void main(int argc, char **argv) { uchar buf[16*1024]; RSApriv *k; int n; ARGBEGIN{ case 'a': privatekey = 1; break; case 'f': format = EARGF(usage()); break; default: usage(); }ARGEND if(argc > 1) usage(); n = -1; if((k = getrsakey(argc, argv, privatekey, nil)) == nil) sysfatal("%r"); if(privatekey){ if(strcmp(format, "pkcs1") == 0) n = asn1encodeRSApriv(k, buf, sizeof(buf)); else sysfatal("unknown format %s", format); if(n < 0) sysfatal("encode: %r"); }else{ if(strcmp(format, "pkcs1") == 0) n = asn1encodeRSApub(&k->pub, buf, sizeof(buf)); else if(strcmp(format, "spki") == 0) n = asn1encodeRSApubSPKI(&k->pub, buf, sizeof(buf)); else sysfatal("unknown format %s", format); if(n < 0) sysfatal("encode: %r"); } if(write(1, buf, n) != n) sysfatal("write: %r"); exits(nil); }